Electric-arc lamp



(No Model.) 3 SheetsSheet- 1.

N. MoOARTY.

ELEGTRIGYARG LAMP. No. 308,620. Patented Dec. 2, 1884.

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N. MOOARTY.

ELECTRIC ARC LAMP.

No, 308,620. Patented Dec. 2, 1884.

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N. MoGARTY.

ELECTRIC ARC LAMP. No. 308,620. Patented Dec. 2, 1884.

-UNITED STATES PATENT OFFICE.

NORMAN MOCARTY, OF BROOKLYN, NEV YORK, ASSIGNOR TO THE ELEC- TRICAL SUPPLY COMPANY, OF ANSONIA, CONNECTICUT.

ELECTRIC-ARC LAMP.

fSPECIFICATION forming part of Letters Patent No. 308,620, dated December 2, 188%.

Application filed February 2,1884.

and which said drawings constitute part of this specification, and represent, in

Figure 1,a view looking toward the princi pal magnet, the supporting-arm between the base and the principal magnets broken away to show the commutator; Fig. 2, a side view,

parts broken away for convenience of illustration; Figs. 3, 4, 5, and 6, detached views to illustrate the construction and working of the commutator; Fig. 7, a diagram illustrating the circuit in the normal or working condition; Fig. 8, a like diagram showing the circuit as reversed by the commutator.

This invention relates to an improvement in electric-arc lamps.

The object of the invention is the introduction of a commutator controlled by a shuntmagnet or its equivalent, which will cause the commutator to revolve whenever the are gets beyond a fixed limit, and whereby the direction of the current through the principal magnet may be reversed to cause one leg of the magnet to neutralize the other, and whereby the armature of the principal magnet will be instantly released to cause the carbons to come together, and in such a device, as more fully hereinafterdescribed,and particularly recited in the claim, my invention consists.

The arrangement of the carbon holders,

levers, and clutch mechanism is substan- 4Q tially the same as 111 the patent granted tome November 14, 1882, No. 267,553, and they do not require to be particularly described in this specification, as they constitute no part of this present invention. The invention, however,

4 5 is applicable to other clutch and feeding mechamsm.

A represents one leg of the principal magnet, through which the current is received; B,the other leg of the same magnet, and from which the current passes to one carbon through (No model.)

the wire C from the lower end of the leg or coil B; D, the armature hung above upon a hinge, E, and provided with the usual adjusting-spring,F. Below the magnets is the commutator, arranged between bearings a b, and so as to turn freely thereon. The one part is composed of two bars, (Z 0, connected across the end f, and with the bearing a, electrical connection being made between the bearing a and the two bars (I c. The other part is com posed of two bars, 9 71., intermediate between the bars (1 c, and connected at the end, as at'i, and in electrical connection with the bearing b,the bars of one part being insulated from the bars of the other part, as in the usual construction of commutators. The incomingline G is in connection with the bearing a and the two bars (1 e of the commutator. Below the commutator are two horizontal bars, H I. To the one bar, H, a brush, J, is attached that lies upon the bar 6 in the normal condition of the commutator. From the other bar,I,a brush,

K, extends, and lies upon the bar 72. in the normal condition of the commutator.

To the bar I the upper end, L, of the coil A is attached. To the bar H the other (that is, the lower) end, M, of the same coil, A, is fixed.

To the bearing 1) of the commutator the upper end,N, ofthe other coil or leg,B,is attached.

O is the shunt magnet, P its armature. From the connnutator-shaft an arm, Z, extends radially, and from this arm a connection, at, is made with the armature P. In the normal condition the armature of the shunt-magnet stands away from its pole B, and the armature D is in connection with the poles of the principal magnet, as seenin Fig. 2.

To better illustrate the working of the commutator, I make a diagram Fig. 7. The current enters by the wire G, and making contact through the bars (Z c with the brush J the current passes from the brush J through the wire M to the coil A; thence up through the coil, and from the upper end, L, of the coil to the brush K in connection with the bar h of the commutator, and from that bar h to the opposite bar, 9; thence through the wire N to the upper end of the other coil or leg, B, down through that coil and out through the other end,C, to the carbon, the direction of the ourrent being indicated by arrows. In this circuit the armature D is drawn to its poles, The clutch is operated in the usual manner to form the are. In this condition the parts will stand until the are gets beyond the established limit. Then the current will increase through the shunt-magnet in the usual manner, to close the armature P, as seen in broken lines, Fig. 2. The armature P, in thus closing, through its connection at, turns the commutator as from the position seen in Fig. 3 to that seen in Fig. 5', to bring the bar It into contact with the brush J, and the bar d into contact with the brush J, as seen in Figs. 5 and 8. Now the incoming current, instead of being directed through the brush K and up through the leg A, as before, and thence to return to the brush K, is reversedthat is, the incoming current passes through the brush K to the upper end of the leg or coilA, and returns down through the coil to the brush J in the opposite direction, and thus reverses the direction of the current and causes one leg to neutralize the other. This is the extreme action.

The feeding of the carbons may be accomplished by simply causing the commutator to revolve until both brushes bear on the same bar of the commutator, in which position the current passes from one brush to the other without passing through the leg A, which cuts that log out of the circuit, but does not break the circuit through the carbons. This is always the iirst stage of the action of the commutator. If the main armature does not let go at this stage the shunt will pull harder and reverse the current through the leg A and force the main armature from its poles. To

avoid this reversing of the current, it is only necessary to make the movement of the arma ture of the shunt-magnet so much less that it will turn the connnutator, say, as from the position in Fig. 3 to that in Fig. 4-, to bring the bars of both sets of the commutator-arms into joint contact with therespective brushes.

In the diagram, Fig. 7, I have illustrated the wires G N as in actual contact with the bars (I g of the commutator, and in Fig. 8 with the bars 9 c of the commutator. I do this for convenience of illustration, the connection between these wires and the commutator being shown in the other figures.

I claim- The combination of the principal and shunt magnets and the commutator in connection with the shunt-magnet, whereby in the closing and opening of the armature of the shuntmagnet a partial rotation is imparted to the commutator, said commutator composed of two sets of bars, one set in connection with the incoming line, the other in connection with one end of the coil of oneleg of the principal magnet, the other end of the coil of said leg leading outward to the carbon, and a pair of brushes, one of which is in connection with one end of the coil of the second leg of the principal magnet, and the other in connection with the other end of the coil of said second leg, the said brushes arranged the one to bear upon one set of bars and the other upon the other set of bars, whereby in the working condition the incoming current passes through the commutator and the respective legs or coils of the magnet to the carbon, but so that upon the closing of the shunt-magnet the commutator is turned to reverse the relation ol'' the bars to the brushes, and whereby the current is reversed through one leg ofthe magnet, substantially as and for the purpose described. NORMAN MOCARTY.

\Vitnesses:

W. F. Biinoocic, NOBLE PIrILLIrs. 

